cleanup the dma_pgprot handling v2

cleanup the dma_pgprot handling v2 · Christoph Hellwig <hch@lst.de> · 2019-08-26
[PATCH 4/6] dma-mapping: make dma_atomic_pool_init self-contained · Christoph Hellwig <hch@lst.de> · 2019-08-26
[PATCH 3/6] dma-mapping: remove arch_dma_mmap_pgprot · Christoph Hellwig <hch@lst.de> · 2019-08-26
Re: [PATCH 3/6] dma-mapping: remove arch_dma_mmap_pgprot · Paul Burton <hidden> · 2019-08-27
[PATCH 5/6] arm64: document the choice of page attributes for pgprot_dmacoherent · Christoph Hellwig <hch@lst.de> · 2019-08-26
[PATCH 6/6] MIPS: document mixing "slightly different CCAs" · Christoph Hellwig <hch@lst.de> · 2019-08-26
Re: [PATCH 6/6] MIPS: document mixing "slightly different CCAs" · Paul Burton <hidden> · 2019-08-27
[PATCH 1/6] unicore32: remove the unused pgprot_dmacoherent define · Christoph Hellwig <hch@lst.de> · 2019-08-26
[PATCH 2/6] arm-nommu: remove the unused pgprot_dmacoherent define · Christoph Hellwig <hch@lst.de> · 2019-08-26
Re: cleanup the dma_pgprot handling v2 · Christoph Hellwig <hch@lst.de> · 2019-08-29

From: Christoph Hellwig <hch@lst.de>
Date: 2019-08-26 13:26:15
Also in: linux-arm-kernel, linux-iommu, linuxppc-dev, lkml

Hi all,

this series replaces the arch_dma_mmap_pgprot hooks with the
simpler pgprot_dmacoherent as used by the arm code already and
cleans up various bits around that area.

Changes since v1:
 - improve the new arm64 comment
 - keep the special DMA_ATTR_WRITE_COMBINE handling for mips and
   document it

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